Missouri's Michael Porter Jr. (13) talks with his brother Jontay Porter during the first half in an NCAA college basketball game against Georgia at the Southeastern Conference tournament Thursday, March 8, 2018, in St. Louis. (AP Photo/Jeff Roberson)

UPDATE: Michael Porter Jr. is "feeling better" after an MRI on his hip returned clean, Shams Charania of Yahoo! Sports reported Thursday early afternoon.

Porter Jr. could decide later Thursday to reschedule his Friday workout.

Teams have been informed that Michael Porter Jr. is feeling better and MRI returned clean, with "positive review," league sources told Yahoo. Workout assessment could be rescheduled on Friday, sources said, but decision likely comes later today. https://t.co/bUkiFyQMkq

NBA prospect Michael Porter Jr. has canceled a pro day in Chicago because of a strained hip, ESPN's Jonathan Givony reports. He woke up Thursday feeling muscle spasms.

The pro day was scheduled for Friday and was supposed to be his second. He conducted his first one a week ago.

The former University of Missouri forward missed nearly all of this past NCAA season because of a back injury, which was classified as a left hip injury when he first got hurt. In November, he underwent microdiscectomy surgery, an operation on his spine. He was not cleared for basketball activities again until March.

The back injury came only two game minutes into Porter's season, but he returned to the team just in time to play in a conference tournament game against University of Georgia and an NCAA Tournament matchup against Florida State. Missouri lost both games. Porter scored 28 total points on 9-for-29 shooting.

Many recruit rankings deemed Porter the No. 1 prospect in his class coming out of high school. At different points, he has been the anticipated No. 1 pick in the 2018 NBA Draft. Of course, that's changed -- slightly.

University of Arizona big man Deandre Ayton is expected to go first to the Phoenix Suns. Givony reports, however, that Porter's camp, which includes experienced agent Mark Bartelstein, feels "comfortable with his stock" and that the Sacramento Kings, Memphis Grizzlies and Dallas Mavericks are interested. All three of those teams draft inside the top five.

Teams, however, seem to be all over the place with Porter, whose medical history has flat-out scared away some organizations who could otherwise be in the mix for selecting him during Thursday's draft.

The Chicago Bulls, who own the No. 7 overall pick in the draft, conducted a recent medical exam on him. They eventually spread the results, which Givony reports were "encouraging," around the league. "There doesn't appear to be anything wrong with him right now," an NBA executive told Givony.

Porter is a versatile, 6-foot-11 wing who, in his best-case scenario, can splash jumpers with range out to the 3-point line, guard and take defenders off the dribble. Teams could use him as a small forward who takes advantage of other wings with his side or a power forward who punishes bigger guys with his athleticism and shooting ability.

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Fred Katz covers the Celtics for MassLive.com. Follow him on Twitter: @FredKatz.